package interfacesDemo

import (
	"math"
	"fmt"
)

/**接口*/
type geometry interface {
	area() float64
	perim() float64
}
type rect struct {
	width, height float64
}
type circle struct {
	radius float64
}

func (r rect) area() float64 {
	return r.width * r.height
}

func (r rect) perim() float64 {
	return 2 * (r.width + r.height)
}
func (c circle) area() float64 {
	return math.Pi * math.Pow(c.radius, 2)
}
func (c circle) perim() float64 {
	return 2 * math.Pi * c.radius
}
func measure(g geometry) {
	fmt.Println(g)
	fmt.Println(g.area())
	fmt.Println(g.perim())
}
func Run() {
	r := rect{3, 4}
	c := circle{5}

	measure(r)
	measure(c)
}
